When I start Konfabulator, it checks the Weather. But it can't connect to it, if I don't quit LNS.
There's nothing in the log file and LNS doesn't alert me about Konfabulator.
DonKid.

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I do not know "Konfabulator", but maybe it is using your already allowed IE...
You could try creating a rule in Internet Filtering on top of all other rules, where you allow everything and activate the exclamation mark to write all events in your log file. Then check your log file while starting Konfabulator (don't forget do deactivate the rule after the test )